Generate HTML coverage reports (#1259)

novemberborn · sindresorhus · commit 8a8669c7f89b · 2017-02-13T23:57:32.000+07:00
This makes it easier to inspect the code coverage during development.
diff --git a/package.json b/package.json
@@ -197,6 +197,7 @@
   },
   "nyc": {
     "reporter": [
+      "html",
       "lcov",
       "text"
     ]
